Milking-machine.



G. H. F. BERGLUND.

MILKING MACHINE.

APPLICATION FILED JULY 1, 1912.

Patented Feb. 16, 1915.

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STATES PATENT OFFICE.

EENEIK BERG-LUND, OF STOCKHOLIVI, SWEDEN.

' MILKDTG-MACHINE Specification of Letters Eatent BatentedFeb. 16, 1915.

Application filed July 1, 1912. Serial m. 707,074.

ing machine, which in comparison with such v already known afiords, in the same machine, the advantages of a cheaper manufacture, simpler construction, easier manageability, greater lightness and less sensitiveness, greater security against a detrimental effect upon the animal and cheaper driving means.

A form of the invention is illustrated on the annexed drawing, in which Figure 1 is a diagrammatical vertical sec-- I tion of the driving apparatus, Fig. 2 a teat tube with parts belonging thereto also in I vertical section and Figs. 35 details.

For each teat the milking machine possesses a tube a (Fig.- 2), surrounding an elastic sleeve 6 of india rubber or the like with a less diameter than the tube. This sleeve is bent over both ends of the tube and fixed in a suitable manner, whereby a teat tube with double walls is formed. Near the lower end the tube is provided with anopening 0, in which a hose (Z is inserted the inner mouth of which is in contact with the elastic sleeve 7). The hose is connected to the tube.

The upper mouth of the teat tube a is covered by a cap 6 of elastic material consisting of an indie rubber plate provided with a central-opening and having its edge turned over the upper edge of the teat tube and tightly surrounding it. The lower mouth of the teat tube is closed by a bottomplate 3, which is tightly pressed against the edge of the tube by means of an indie rubber plate 9 or the like in such a manner, however, that the joint between the bottom plate and the tube is not covered.

The driving apparatus (Fig. 1) consists of a vacuum pump 72, connected to the teat tubes and having an oscillating piston, at the movements of which the constant quantity of air inclosed is alternately rarefied and compressed. For the purpose of regu lating quantity of air in this pump (via. to compensate for leakage, etc.) the pump at every stroke is connected with the outer air for instance by a pipe is, connecting the chambers on both sides of the piston. This regulation, however, of courscmayals gbe effected by means of suctionand presFirevalves.

The teat tubes are, connected mutually by means of a mouth piece (not shown on the drawing) and with the pump by means of a hose Z. They are placed upon the teats during the working of the pump in such a manner. that the openings inthe caps e' are pressed against the tops of the teats, whereby the teat tubes are sucked up against the udder and are held in place by the action of the said caps.

The air inclosed in the pump it and be tween the walls a, b of the teat-tubes becomes periodically compressed and rarefied, at the action ofthepump, and produces hereby a corresponding compression and rarefaction of the air in the teat tubes, thus alternately sucking the milk from the teats and forcing it out through the joint between the bottom f and the lower edge of the sleeve 6, the said joint of course being tight during the suction. The sleeve Z) in the teat tube hereby acts about as the diaphragm in a diaphragm pump. The teat will be exposed to an alternating expansion and contraction, wherebythe circulation in it is maintained normal. The movement of the teat tube becomes as similar as possible to the sucking of the calf. The quantity of milk sucked and forced out at every time it limited thereby, that in a.

certain moment the milk by its pressure upon the lower part of the sleeve closes the mouth of the hose (Z, thereby breaking 05 the connection with the conduit to the pump. lVhen the udder and the teat are filled with milk there is quite tight joint between the teat and the edge of the opening in the cap a, but according as the cow is milked out, this tight joint successively decreases and at last almost ceases, when the teat is emptied, whereby the outer air is forced in the teat tube and the mouth of the hose d is closed, so that the suction does not reach its maximum and the teat is not strained unnecessarily. The milk flows into a receiver placed under or at the side of the cow, either directly o through a conduit or the like provided with a collector.

Having now particularly described the nature of my invention and the manner of its operation, what I claim is:

1. In pneumatic milking machines operating alternately with suction and pressure a teat'tube comprising a bottom, a rigid outer wall, an inner Wall having a smooth inside and being sufficiently thin and elastic to embrace the teat tightly when pressed against it, and a hose projecting inward through a hole in the outer Wall so as to touch the inner one With its mouth;

2. In pneumatic milking machines operating alternately with suction and pressure a teat tube, comprising a rigid outer wall, an

inner Wall having a smooth inside and being. sufliciently thin and elastic to embrace the I teat tightly when pressed against it,-and a bottom which is resiliently aflixed to thetube so as to leave an opening between them underthe action of the pressure from the milk.

3. In pneumatic milking machines operating alternately with suction and pressure a GUSTAF HENRIK FABIAN BERGLUND.

Witnesses:

H. HAMMAB, CONTA PRIM.

come: of this patent may be obtained for five cents each, by addressing the Commissioner f Patents.

Washington, D. G. 

